Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e27c6e0a8df1c4bffc55f35d9e53042419a5aed795a3948d7cd6adbb09d3ec6a' 
  AND token = 'wYJirKK0J9CFRijivhT8QKMXDGpT4pqRIxLQG9o2e9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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