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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ec2bf56b6b8696605847d5bdf59fc7d806ea28b395df37a8da3cbf6d64a7274' 
  AND token = 'yd/0Ah20bP1x4oWbmjuglimRkiumbxXB9YlQHKVkHUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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