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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f6064f36b6f7b4883e97904442e4529b2b4b19facafedf0fb97ad7e8d1b8b0e' 
  AND token = 'k7VesF1WDwckxu2P1HzcpLXzuWYgcacIknWfhF4THqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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