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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75220ead59526ee84dda18c3007086f72eba5d2212236f35bf9110cac3418c3d' 
  AND token = '7ZKrnr/8bsK0C4nYp+j2txb1CxKR06oVesTVblT5PNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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