SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70eafda2acf3ff2e18ee99ab982529ded55186743ad0178a743c247606b92b98' 
  AND token = 'CpQYPGnZYRF0FKCjN7dA9xhmQzM9SCKlq4+C9HdCIjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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