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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ba135363346f033c07eb5aeff3b08c1a996b17513c49d8f3fd1387b53b48543' 
  AND token = 'qPJP7Xni0DPYzxQdY/yomN+3Rbb0coS9Kht+2TbJW/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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