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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c7862d01fb32250e253f4cb01f5595f1c2fc44d61333713847f421525f932bc' 
  AND token = '+8RALbusE7z4HOzsr4WQkYQiH0nsEwo233txOdPEIF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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