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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da322e5ed358f5cc7ce358ef8bc595f0fb88f3b31e8be78cc4a2f58d07e2e16b' 
  AND token = 'yhNqGgOf6xC7ghTu5Ot/hU52S26PTA0TCrzYBob7wOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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