SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f548a018aee51788d66094729d610f2c1a5f7736fd2a5b322ffa900e24c4322' 
  AND token = 'CBAPIma0PwjJ+/6Psn3iyS9hFng9tYgFKSMJWgQ4P+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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