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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a55f53853691b8970a45fe5fab2fd82abfa6d52fc5a26089af3931cfdbb6dbb2' 
  AND token = 'Dvw6a9THkg++NFQ8GWdoHZ1ct34f5ClhB5jkJkl9sUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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