SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c63ea68820f7892cc4d462d155db77136e1207dcd12740be1d190a123a15f85' 
  AND token = 'wTX5aWqgrEDTfuG4A+quA7LdCYRUBwZ1fIzry0QnRlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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