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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17d132e812be68f2b270452498c750ea33faa439a14f1ba8687b1486181c85d8' 
  AND token = 'wsXhUEhPMfI4K90bc88S3TaTSphNKhyb1Tp5YnyZB0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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