SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33e5bc4fd4038b717a255d5949ef7a7f7d2467472f1f196f50ea9c0f1645f70f' 
  AND token = '3LGqcH2QKdCv80u7UvvMpNrgrco/gMGVUzAB1ZalOTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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