SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b157e514bd918f527706264843b2672298d95fef0d4d57f50d2a131c219f2204' 
  AND token = 'CeQmbYkQNsKJOnbsGZi2w2Ap/GpVZ73wruqrYZBEAkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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