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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1027437c9652d65d5d3dbf5872c8534177eb6cfc408cd18b50f41a3456d433a4' 
  AND token = '+2PZ1TcaU5fyt1khx9eByvFr0dfvo7FNRY3gBZnNymo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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