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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d90b4f4e6450ef3c9645ddc7708dc42c587ad1545a5bf0abff9ee2d9380b670' 
  AND token = 'pjCwYDRnUt8lQEjzC2LmibCtxOpo/QY6UKQe5Rpetpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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