SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '692f3ab30f4d67a0b1e0e2ff1ebf94bce5d9f23cd1538dfec18689789d0d915f' 
  AND token = 'dgugo4tOD2Yv54Cw5toQrqAuVo3BBtbJGNCuwuKsaAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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