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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55c70a27663ea76077431fd7fc58d6a8a92e11d4242d24bcd0d012132bbab75f' 
  AND token = '1ofs3Tom3UNgUt/sh7S15QtlOSnQh7NOoudchQIiyQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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