SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f88cb6dd18601fcef5560b0df4aab3c16ded3361a61c8a1a90b840dd4e42d19' 
  AND token = 'Ztw2zqtTCzvhP0TuUcMK5bQIg43U2Vw+j6gCWTDB4Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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