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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ac16c09d35c99047ba2d8b8f68250cf4eb69d6d5705b027557bc3e6cb8c79ce' 
  AND token = 'BmEfOi4L+t4MCixIz1Rt3yF9tLOydGAIN2lCaxgSff8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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