SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6115ba70f9382be6e1e50ad84299593ea59fa223c3b2538c6a70346c543a2678' 
  AND token = 'T3hO+pLzWO9lwNww3MJh4B1bIKv2/VHJaOfIkSbqJKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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