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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47267dd15fa2724e2b01ba45033405fa256988bae556a6c403c0feb35c57c127' 
  AND token = 'p3PAEBo619cIy6BgsSln7nSNMAtkbklHRvX+WRikgEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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