SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f93ea8c9b32d6c8b7edf0c9c228c6701a691f3511ea131ea67ca73b2dcb5d29' 
  AND token = 'NFXhtMJ7GC5MYKGPRBGu9K+oxw7h+2yVXZWKnV0FP/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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