SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f94d3d73f29c07f81bb4778cbc7e0d8b7ef212bda4508a030dbc6f610f46d9d6' 
  AND token = 'fU0zUjuYeSKe5i5WQiTm2g+gDsY3G0tbHEoB+RJRmAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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