SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1012663f745dc572c99dfac79de522fc65e1f363da723a82794494be7cbbcba' 
  AND token = 'zgpLCHKhPFEubZJ4m2iC/Tq2wXMHMVvz4DtQ2Xz9Fcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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