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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30ba1ee744ceaf10f63666b3251435bb028b168b62430f75fa65c418d0fece41' 
  AND token = 'q5UENC+J9CdB45/iNvEXOWVCuGdD583qenJ+5FTckXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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