SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35f5ed2203fd02368da4e66b411aadf8a100d7c345a7eb1b48d469984171a367' 
  AND token = 'LHbjH17uXgALRnG7Fqc9QEyryQGXNuMVEADCCc/ZY60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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