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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5590e754d9c1d7982ea95561dbe47837a69fabb52b3ebef5e74a686f812639fc' 
  AND token = 'y+d6sHiwOCdjbdZ0ld/f8nogQ82uplnVo7tvk4Jn560=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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