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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9687813cbd368dea88dcb225c9baf7754c84f3ed7ed75450816644eca55c9cbf' 
  AND token = 'bbyC05hvxFwvYyNCoaAVgNZ28Cdl+Nps8+Rbwh7evUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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