SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b384a6923d17463f46a10e6c78a08d431f044ee96280f1275a9d0f76f84c79a1' 
  AND token = 'OPtizDpTE9VG6AFGCN1uTtmZscotgUVFv4hpg/QIYX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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