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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7e83ca5cd43761e26155eb8b05ba8c66115057fb8a9d156d3442873e6b8913f' 
  AND token = 'aoDXkGHKWLyNgv6oqLnWTR3Lem+7xa7yA+M+J9cqYOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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