SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df4bda9d54a0290916394ce46b348d079b99f931cd3202378072b9c3f8ac115e' 
  AND token = '6JBjxvMRBgD7ghBu42TTO3jY6wJiwd2FO0+2GSJ7tE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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