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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ebfeffde3c69336d7b190d11488cfb2a73792ae2eea54d5c4bd46a716531b9d' 
  AND token = 'HSoEUyURMc/8fE+3x2RRa8bVbj8NgYcEQ1P52a1UI+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}