SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '710a2ab0a2f40d5a0915bc8ef6e65aa19ad5fe02dc6553beece27a32a325cda8' 
  AND token = 'QzQJX1IRVwGymJMxYc1lSY+6fdfFg4WCaZdKjzEh3j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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