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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b754fcc2eb3e9864d680bba9a6055ed6f96c3f5fb89c9abd501a4a99401b76b' 
  AND token = 'sTDeJjVGFH/FJS0x07FOqUpJoWZ83V9kdKhCNM5NexU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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