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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0889349b370b8e12182d680d379032e0c3efabf472c206e7619ad3a9e541786' 
  AND token = 'iho8IEDsHk8h1BTZIyliSH7j40beIjDdxn7BQ65/cEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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