Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c743752fbe8c49dc2a4c73d28184a34bca8b1a41b0103ac96ac492d83cb7a29a' 
  AND token = 'xBUckaH99JWUZWUs4bW/mzS05m/DFXMBiCq/jKYDYJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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