SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f321105067f716b07e19659624e64a9ef219592856b6c5495fd8b3c8128e473' 
  AND token = 'u9bKmg4b1Mk3B/rCX9DKJ5/lTt/R8HgFiUsjV1e+4A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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