SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53afe214a4b460a74c1dcb228baa687b86aedd38363909c801627a16581b02b1' 
  AND token = 'ZMJqEZ5xBf2OGJkIOKR8qMZgUkOBMFE1xBIYjL7sy1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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