SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4ea9159046c6da24075c87d238eb30b3b6653e71c5f7784554797297b08a05b' 
  AND token = 'f8FA4Z+jfcBPMDV3mIqyDewz+JNxj/pfNzY/WgZi1TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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