SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b062f821aaae40a554041fcbf205554e7bc96c23591203548b7365a28d0b2ca8' 
  AND token = 'M9IO3v5gKyr15TNv+cHU+zYqgzfb+V75iq6kcBJ1V0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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