SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66d0c9ea8f1a23fead44a729ba975c7288a0da1d953d77ebe4252986ca671b8a' 
  AND token = 'XKVbvJXhD5QZfrUMNYnw5MwAuGoXNsgAvzW8wOFPusA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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