SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fdf24208db124f89f941e5f2849cb8d74429db8a91d4687f91c680f4c0305c1' 
  AND token = 'qZkkCKemqOr53TlhVTk99u3jrzJgenCk+yixorusJHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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