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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71febe4f63568d76c056603e69c4d56dba410b92af89769fc9616111e1aca15f' 
  AND token = 'wIdPbJ1BDpH7/9O6la59ESqKKu2e3ynIgFxZw73ROdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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