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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '423e09a43de4a58024c7e17fb673ad15d55d0d7fb66625b25892a550db3b8b43' 
  AND token = '13jN8l1V2w0Nd2NAuEiEMQwGKv2QVG36r5i315Ymi+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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