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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '228a22e8f3cc8df26c493e324774394d6f8db8d8cf7f74c35918b597f08fa3ac' 
  AND token = 'Hjw0VKQH42n+rWRmI/k85SZxH7W+JliN1aQ4H4gSO48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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