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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7627a558006790ba91ac02d6b2145d579eee7bb4c40cbc7128948785516574f5' 
  AND token = 'J/o7XG4QhhFAtzytYWF46UC7naZB5dW80VT1X9ydKA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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