SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0a8590175e9955b0527924ca08ffd4c7981d28312a4666017700536af894a8b' 
  AND token = '4KOafrgEiBHghbMZfQi1Cun1fymY5jc9FPhglT6VqPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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