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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f83778f4a232e20de0de0733f878eeec5fb7ab7acfb348b507485975f49cdbc' 
  AND token = 'bIDL4/MKvl9WMYHQqDTalHuC3JF5tNJsJZyOJ/l2y/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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