SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dab937b905602dfc443b6a7d30ae87aafe49f39851cd1584e33f51a8ccade556' 
  AND token = 'gMZNvf16+LU0aEk9aOGKmtn8V9EzMKQ2jWn5P9qZBgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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