SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a8ac52cf27aa0b939f8c8ccc1c22674a59d3f7a450ef04b54bb92a7377fa566' 
  AND token = 'NEYVG+4pV36Pfs9wuD7n4+lALxGfpzQsZw7/1yvf90w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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