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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f3dd17fdd9ca8cd309fd0d4e1fcb01d58e5bfe206a8513615e89997d9b93f47' 
  AND token = '6ckGy/02pxCg2HetAbju2nxcAZxNpSUV1QRXMVYK8WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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