SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86a612e21a0386ae3c6cb5cf45dd2e2c08c87415d88ab49e278f083370e41ea8' 
  AND token = 'qg5PwsGnYQ6j7HkGQ9Z2K+8mWv/Bjawj2uBA2hdxA/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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