SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83e5045da922e8da2a59be424e3cef9df30234172fb7065fdb88daf75975dc60' 
  AND token = 'NwpG6jjl+R2o+H7kgMJSftxVIDiPP+UWtS78Dy+rIhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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