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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91bf02e437bb83c7c7191f87028f4e303c84b12926b7f41c670537d579d04366' 
  AND token = 'LbctNgmsNKYAM1/1hFBdW0v9tUdNzMTFhkLg40rvNBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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