SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '834040fd106fb6ef02eb3c2bdb4521492ba55bae5e9b8c6bf0121d087b2bc21b' 
  AND token = 'IghvhOWwXPzNlFjd9+wLYdUZpxvBBpoqk2KOOQwsgOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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