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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15c0f706e35ac5cd180843b33db6a176c412851d8fe9dd522ebb75ea084accda' 
  AND token = 'D8agHDKAbsGwUYX9WL2vSldOmou+MnbakalVgdPVt/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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