SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94b3f62388b3ef21bb4c343e01533558d94669632d01fb4a505dadb8634a9bd8' 
  AND token = 'jvFzKcOvPKGGUtAmnmu/eJLppf3y1GK6Mx7FPkhlCjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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