SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbfdba45b2d53a850d7d7c36d1e05e31997e01a9e83f596567a77930d1587826' 
  AND token = 'vKUlXE3uO/Rp9i00anfnkFBia2JMm8RuK7jRQYohzGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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