SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc32243b4e80ccb33e5fa96ab53c7b9aa3021b323b68fbe32f328f4e7f7924aa' 
  AND token = 'Bgd9nYGQbXFybP2VPTv+wjTcHo1OBHmvqXkL5DZAPKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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