SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '269819f2417beb4c14869e0345c571c0f6a73eea533c5a729615fd8adf969b15' 
  AND token = 'OOd/BqMLGjEFfYxhTFbzE/QZn9Sqono7Zm/bC+9L+sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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