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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bded340f6304e5aa95e42d3a74f8b6ccf0e87bc46f994b85752ca16bd1c94672' 
  AND token = 'YaOmVuioRlIfHF9dRuhb6AF5OueH48S1+vMeVPNU8t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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