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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '518f97cff0bcb918b56d5e029854ae90c6bae10726e5d3a7a2febecd61d01d23' 
  AND token = 'fQ1lziSmciBnyGn8TARIuq2SLtWq4jhxdK0JG9p92es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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