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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b92733bb66f428363b4e26e343662c663dd6b06b81e954efa1abee213149b295' 
  AND token = 'QkHz68yqvr9sovyNRoaFv+a7HcXEKPQCNL1XQbrQW8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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