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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3de4bbcd930034c65a1072ee34063ec1d1d999b76fade8ae74af4689ae762f66' 
  AND token = 'Jv1LsSBbXLSt6JX21GirJcFriAQjYOrp2xmVJGm1roc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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