SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '053220fb359f775ef48f934710a164a6b486788a5c51f298a1767b974ee25127' 
  AND token = 'li2zMBYhtYc2sls2gCVOT8s6j+ODMTGmmVlcjiFxsX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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