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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ff3c5e9f1ec590ba955b40ca3fa6085eae4e9c6735b2b5d56dd367a28e24e3c' 
  AND token = 'EF3PBe16ctYzUGVD3s8Br5pcA8SaWo6U/GrTGAnpDkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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