SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fae86cc9cd4b2b598c8033b5b1b6407791804a770d5cb6d6635d1c24c3874953' 
  AND token = 'FZzfymKi9Vh2+sAMZUYxenkfdKA+pUlhkkxk56j10j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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