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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffcdb28c508f0fb86cf6343c0a31b8398e20291eddd499389ce26d15872b5bd4' 
  AND token = 'iDTJ82f3qNfry6bG5yEXZLlXd409J+sKPo2etp4kJ5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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