SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64598fb02ccfdfb5c007debf0a078847fb3d6a99e6b2a143b41fa1d4df13d7b4' 
  AND token = 'qNeSEHGCGck2rMwM3Jqo9GkaKZxoUR/hnhPhgHL+cOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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